But how do you reward people within the system? You need some sort of token with value...

You could contribute to a goal that they care about, or give them something they need, or help find somebody who will. Or you can promise to do so in the future.

Using "value" as a medium is problematic because we increasingly don't value the same things. It worked ok back when food took so much effort to grow that securing it represented a significant portion of our mindshare. Then money was reliably a proxy for our shared agreement that food was good.

But now that it's so much easier to make the necessities that we agree on, we spend more time perusing contradictory outcomes. Which is more valuable, if my endeavor succeeds and yours fails, or visa versa? Whose agenda am I furthering when I decide to value a dollar? It's hard to participate in because I can never figure out whether I'm hurting or helping.

Better would to let people be explicit about what they want so that we can the things that have consensus and work towards those. As it is we're letting the ownership of scarce abstractions determine what gets done, which is just bonkers. It was once the best we could do with only the laws of physics at hand to enforce the rules (re: the scarcity of gold), but now we can do better.